Confirm that the METplus differences logic handles MTD output file

[dwfncar]

Describe the Task

The testing infrastructure for MET does not do a good job checking for differences in MTD output files. It first calls diff, and if there are no differences, everything is fine. If there are differences, you see this type of error:

COMPARING mtd/mtd_BASIC_20100517_010000V_2d.txt
file1: test_output_rev5319/mtd/mtd_BASIC_20100517_010000V_2d.txt
file2: test_output_rev5351/mtd/mtd_BASIC_20100517_010000V_2d.txt
cat: /d3/projects/MET/MET_regression/NB20180319/test_rev5351/hdr/met_NA.hdr: No such file or directory
Error in strsplit(strHdr, " ") : non-character argument

In addition: There were 50 or more warnings (use warnings() to see the first 50)

ERROR: compareStat() failed

This task is to update the testing infrastructure to handle the MTD output.

Time Estimate

Estimate the amount of work required here.
Issues should represent approximately 1 to 3 days of work.

Sub-Issues

Consider breaking the task down into sub-issues.

• Add a checkbox for each sub-issue here.

Relevant Deadlines

List relevant project deadlines here or state NONE.

Funding Source

Define the source of funding and account keys here or state NONE.

Define the Metadata

Assignee

• Select engineer(s) or no engineer required
• Select scientist(s) or no scientist required

Labels

• Select component(s)
• Select priority
• Select requestor(s)

Projects and Milestone

• Select Repository and/or Organization level Project(s) or add alert: NEED PROJECT ASSIGNMENT label
• Select Milestone as the next official version or Future Versions

Define Related Issue(s)

Consider the impact to the other METplus components.

• METplus, MET, METdatadb, METviewer, METexpress, METcalcpy, METplotpy

Task Checklist

See the METplus Workflow for details.

• Complete the issue definition above, including the Time Estimate and Funding Source.
• Fork this repository or create a branch of develop.
  Branch name: feature_<Issue Number>_<Description>
• Complete the development and test your changes.
• Add/update log messages for easier debugging.
• Add/update unit tests.
• Add/update documentation.
• Push local changes to GitHub.
• Submit a pull request to merge into develop.
  Pull request: feature <Issue Number> <Description>
• Define the pull request metadata, as permissions allow.
  Select: Reviewer(s) and Linked issues
  Select: Repository level development cycle Project for the next official release
  Select: Milestone as the next official version
• Iterate until the reviewer(s) accept and merge your changes.
• Delete your fork or branch.
• Close this issue.

[JohnHalleyGotway]

Note that #2718 switches from internal MET differencing logic to using METplus instead. Confirm that differencing of MTD outputs are well-supported there.